get-latest-versions

#!/bin/bash
#
# The MIT License (MIT)
#
# Copyright (c) 2016 Sascha Vogt <sascha@vogt-neuenbuerg.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

IMAGES_URL="https://www.versioneye.com/docker/remote_images.json"
RES=$(curl -s $IMAGES_URL)
if [ -n "$RES" ]
then
    #filters json, removes apostrophes,splits CVS, removes empty line, sorts by name
    echo $RES | jq 'keys | reduce .[] as $item ("";  .  + $item + ",") | tostring' | \
            sed -e 's/\"//g' | \
            tr "," "\n" | \
            sed '/^\s*$/d' | \
            sort -d
else
 echo "Failed to request remote images at ${IMAGES_URL}"
 exit 1
fi